Students should be directed to manipulate this simulation prior to watching how to solve concentration problems. This is an excellent introduction to the concept of concentration and how it can be altered.
There is a teacher guide to using this simulation if you wish to further explore the simulation.
The above video outlines how to solve concentration problems using percentage concentrations (mass/volume, mass/mass, volume/volume).
Students should be asked to watch the above video at home (if they don't have access the video should be available for them to watch in class). Students will then come to class and divide themselves into their level of understanding (really understand, somewhat understand, don't understand and haven't watched video). The students will be given problems to solve in their groups (depending on their understanding) and the teacher can circulate and help the students.
Challenge questions should be provided to students who have mastered this material. Extra questions for basic understanding can be taken from the students' text book to help the group of students struggling, in addition to support from the teacher.
Again, students should be directed to manipulate this simulation prior to viewing video 2 below to have a better understanding of how moles, volume and molarity are related.
There is a teacher guide to using this simulation if you wish to further explore the simulation.
Curriculum Expectations: 2.1 Use appropriate terminology related to aqueous solutions and solubility 2.2 Solve problems related to the concentration of solutions by performing calculations involving moles, and express the results in various units
Introduction: Concentration Simulation
http://phet.colorado.edu/en/simulation/concentration
Students should be directed to manipulate this simulation prior to watching how to solve concentration problems. This is an excellent introduction to the concept of concentration and how it can be altered.
There is a teacher guide to using this simulation if you wish to further explore the simulation.
Video #1: Concentration of Solutions Part I
The above video outlines how to solve concentration problems using percentage concentrations (mass/volume, mass/mass, volume/volume).
Students should be asked to watch the above video at home (if they don't have access the video should be available for them to watch in class). Students will then come to class and divide themselves into their level of understanding (really understand, somewhat understand, don't understand and haven't watched video). The students will be given problems to solve in their groups (depending on their understanding) and the teacher can circulate and help the students.
Challenge questions should be provided to students who have mastered this material. Extra questions for basic understanding can be taken from the students' text book to help the group of students struggling, in addition to support from the teacher.
Practice Problems: Percentage Concentration
Introduction: Molarity Simulation
http://phet.colorado.edu/en/simulation/molarity
Again, students should be directed to manipulate this simulation prior to viewing video 2 below to have a better understanding of how moles, volume and molarity are related.
There is a teacher guide to using this simulation if you wish to further explore the simulation.
Video #2: Concentration of Solutions Part II
The above video outlines how to solve concentration problems using parts per million, parts per billion and molar concentration.
Again, students will be asked to watch the video at home. The same will be asked of them as above.
Practice Problems: Parts per Million, Parts per Billion & Molar Concentration
Curriculum Expectations:
2.1 Use appropriate terminology related to aqueous solutions and solubility
2.2 Solve problems related to the concentration of solutions by performing calculations involving moles, and express the results in various units